Installing & Activating Licenses to my AutoDesk's Civil 3D on my Diagonised Machine

Hooray!! I have had an issue with my machine and I could not bear with it (the issue) anymore. I sent out my PC to my seller's advanced resolution center (at Houston Texas) for diagnosis. This happened twice in a row. In the process, I lost all the software and their licenses. I had to reinstall and get back all the license keys to activate and continue working. Civil 3D 2021 is one of the software and when I got the PC, back I was excited not only to have the license back but also to have the latest versions of the software in my little nice and kind PC. Anyways, just being too nice to her highness, TKM's machine's ---